Fully metal construction for durability M42x0.75mm male and female threads for compatibility Eliminates focusing problems in astrophotography Available in multiple lengths: 3mm to 30mm Anodized aluminum finish for a sleek look The T2 Extension Tube Kit is designed for astrophotography enthusiasts, featuring M42x0.75mm threads for seamless compatibility with telescopes and cameras. Constructed from metal with an anodized aluminum finish, this extension tube ensures long-lasting performance. It effectively solves spacing issues and helps achieve the correct image scale, making it an essential tool for reducing focusing problems. Available in lengths ranging from 3mm to 30mm, this kit provides flexibility for your specific needs in capturing stunning celestial images. Color: Black Material: Aluminum Alloy Package Contents: 1* 3/5/7/10/12/15/20/30MM T2 Extension Tube Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.